js简版定时器

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>定时器</title>

 <style type='text/css'>

 #box {width:80px; height:80px; background:#f00; position:absolute; left:50px; top:50px;}

 </style>

 <script>

        var $time;

          function $(id){

              return document.getElementById(id);

           }

           function start(){

              $("span").innerHTML=parseInt($("span").innerHTML)+1;

              $time=setTimeout('start()',1000);

           }

     window.onload = function() {

          $("start").onclick=function(){

                 start();

              }

              $("end").onclick=function(){

                //取消定时器

                 clearTimeout($time);

                 $("span").innerHTML=1;

              }

       }

 </script>

 </head>

 <body>

 <span id="span">1</span><br/>

 <input type="button" id="start" value="开始" /><br/>

 <input type="button" id="end" value="结束" /><br/>

 </body>

 </html>
为制作动态时间程序作基础
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